Drill-bit construction



Fan, 13, 1

J. J. BROSSOIT DRILL BIT CONSTRUCTION Filed June 17, 1922 n mm m5 ..5 VWM m m 71MB m WITNESSES 5 fi/ 1w.

JAMES JOSEPH BROSSOIT, OF SALT LAKE CITY, UTAH.

DRILL-BIT CONSTRUCTION.

Application filed June 17, 1922. Serial No. 568,900.

To all whom "it may concern.

Be it known that I, JAMES J. Bnossorr, a citizen of the United States,and a resident of Salt Lake City, in the county of Salt Lake and Stateof Utah, have invented a new and Improved Drill-Bit Construction, ofwhich the following is a full,. clear, and exact description.

This invention relates to a drill bit construction, and has for anobject the provision of means whereby a drill bit can be very easily,quickly and firmly inserted in a suitable socket in a drill shank and isso constructed that it can be quickly and readily removed.

Another object resides in the provision of means whereby the shocks towhich the bit is subjected are distributed over the surface ofengagement of the bit with the shank, rather than concentrated at anyone point.

A further object resides in the provision of a drill bit having a stemof irregular cross section so associated with a socket that it has notendency to rotate during drilling.

A still further object resides in the particular construction andarrangement of parts which are hereinafter described and claimed andshown in the accompanying drawings.

The invention is illustrated in the drawin s, in whichigure 1 is a sideelevation of the shank of the drill and the bit showing a portion of theshank in section.

. Fig. 2 is a side elevation of the same portion of the unit taken atright angles to the showing in Fig. 1. v

Fig. 3 is an inverted plan view.

Fig. 1 is a side'elevation of a modified form of the device.

-xFig. 5 is an inverted plan view of the modification shown in Fig. 4. iFig. 6 is a plan view of a tool for removing the bit from the drillshank.

The forms of the invention shown in the drawings are preferred forms,although it is understood that modifications in the construction andarrangement of the parts and in the character of the materials used mabe adopted without departing from the spirit of the invention.

The preferred form of the invention comprises a drill 1 having a shank 2in which is provided a socket 3. This socket inone plane, as viewed inFig. 1, has tapered walls 4 and 5; but in a plane atright angles thereagroove 9 which ma to, as shown in Fig. 2, the walls 6 and 7 areparallel. In this socket 3 the 5118111, 8 of a bit is adapted to beintroduced. This stem, correspondingly, is tapered along two oppositewalls, and the other two opposite walls are parallel so that the stemfits in the socket. The length of'the stem 8, however, is not as greatas the depth of the socket, so that the bottom of the socket receives noshock from the blows transmitted through the bit. The entire force ofcontact, therefore, is taken up along the sides of the socket, wherebythe force is more evenly distributed.

A groove 9 is formed in the side of the bit and extends from the toptothe bot-tom, whereby the circulatin water may flow from thecirculating channel or passage 10 through to the surface of the bit. Thelower end of the bit is enlarged, as at 11, and has a cut; ting. edge12. The head portion 11 has curved tapered shoulders 13 and 14connecting it with the stem 8, and these shoulders are spaced apart fromthe lower edges 15 and 16 of the drill shank. These shoulders are formedat opposite sides of the bit and the spaces between them and the shankare adapted to receive prongs 17 and 18 formed and spaced apart on theend of a tool 19. These prongs are tapered, and when they are graduallyforced into the spaces between the shoulders 13 and 14 and the loweredges of the shank, will tend to force the wedge or drill bit out of thesocket 3. The sides of the bit at right angles to the shoulders 13 and14 are strengthened by abutting dependent shoulders 20 and 21 of thedrill shank which extends below the edges 15 and 16.

In the modification shown in Figs. 4: and 5, the same ideas are involvedwith the exception that a four-point bit 12 is used instead of atwo-point bit.

I have, therefore, provided a simple and eflicient drill and bit inwhich the bit can be very quickly and easily applied to and removed fromthe drill; in which the shock on the bit is absorbed uniformlythroughout the surface of contact of the bit with the drill; and inwhich the construction insures a strong, compact device.

With reference to Figures 1 and 2 it will be seen that the stem orattaching portion 8 of the bit has one side wall formed with beeconomicall formed or rovided in t e stem and which forms an e cientmeans for conducting the water supplied by the passage 10. It willbe-seen that the side of the stem having the longitudinal groove 9 bearsflatly in contact with the adjacent wall of the socket and C011.sequently the stem and the wall of the socket cooperate to define apassage through which the liquid must pass. One of the most importantfeatures of the invention is the fact that one of the dependingreinforcing members and more particularly the member 20 is flatlyengaged with the head of the bit and extends over the forward portion ofthe groove so that the water-conveyed by ,,the groove is discharged atthe working faces of the tool. By thus discharging the water at theworking faces of the tool the efficient and expeditious operation of thedevice is provided for. As is well knowna groove may be formed in thestem much more eco nomically than an enclosed channel may be provided. I

What I claim is:

1. A drill comprising a body having a socket and a water passage openinginto the socket, and a bit having a stcnrrec'cived in said socket andhaving one side wall flatly contacting with the adjacent wall of thesocket and formed with a longitudinal water conveying groove, said h'eadhaving one side formed with a continuation of said groove,

the forward portion of said body being formed with depending reinforcingmembers flatly engaging opposite sides of said head, one of saiddepending reinforcing members being extended over the forward portion ofsaid groove whereby the liquid is discharged out through the forward endof said 7 bers flatly engaging opposite sides of said head, one of saiddepending reinforcward portion of said groove whereby the liquid isdischarged out through the forward end of said head at the workingsurfaces of the same, said socket and said shank being rovided withoppositely arranged paralle side walls and with opposite inclined wallsJAMES JOSEPH BROSSOIT.

ing members being extended over the for- 5

